Last night at midnight was 72 hours, so its been going over 80 hours (my math in the video is, um, poor.
I realize in the heat of the summer i might be lucky to get 48 hours, but in the cool of the fall, it could go a full 4 days. Nice. If I’m without power for longer than 72 hours then I’ve probably got bigger problems than this solution could solve.
{UPDATE} Well its done. I could push it further on the low battery cutoff setting but I think I have the information I need. It quit about 87 hours into the test (fridge temp still 29). The temp on the wall was 81, it gets down to a low of maybe 60, kept out of the sun.
So, 3 1/2 days in moderate shady temps from a 58 Ahr battery to 11.4 volts. Technically the RC rating is down to 10.5 V so again, I could probably stretch it to a solid 4 or even 4 1/2 days in moderate temps, or a solid 2 days with warm temps in the sun but running even a deep cycle that far down in voltage doesn’t do great things for the plates so I called it. assuming I used 50 of the 58 AHr in 87 hours we come up with 1.74 Amps/Hr for 28 degrees in moderate temps out of the sun. EDIT: I am an idiot. 50 amps over 87 hours is .575 Amp/Hr, the rate above is hours per amp.
My next test will be to strap it in the truck and run the same test with daytime heats and sun beating on it and get an average for that.
Why? Cause I’m a nerd. Deal with it.